What Is This Tool?
This converter helps you transform thermal resistance values from degree Fahrenheit second/Btu (IT), which measures heat resistance per second, to degree Fahrenheit hour/Btu (th), which expresses resistance per hour. These units are vital in analyzing heat transfer in HVAC systems, building insulation, and material testing.
How to Use This Tool?
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Enter the value in degree Fahrenheit second/Btu (IT).
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Select the conversion target unit: degree Fahrenheit hour/Btu (th).
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Click convert to obtain the equivalent value.
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Use results for HVAC, thermal modeling, or insulation assessments.
Key Features
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Converts thermal resistance between degree Fahrenheit second/Btu (IT) and degree Fahrenheit hour/Btu (th).
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Facilitates compatibility with heat flow rates expressed in Btu per hour.
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Supports engineering and building insulation R-value calculations.
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Browser-based and user-friendly interface.
Examples
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10 degree Fahrenheit second/Btu (IT) converts to 0.00277592 degree Fahrenheit hour/Btu (th).
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100 degree Fahrenheit second/Btu (IT) converts to 0.0277592 degree Fahrenheit hour/Btu (th).
Common Use Cases
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Performing thermal calculations in HVAC and heat-exchanger modeling where power is in Btu/s.
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Converting building insulation R-values to align with per-hour heat flow units for simulations.
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Comparing imperial and SI thermal resistance units in engineering reports.
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Specifying thermal resistance for components based on heat flow in Btu/h.
Tips & Best Practices
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Ensure the heat flow units match when performing conversions to avoid errors.
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Use this tool to convert values before inputting them into thermal simulation software.
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Refer to the conversion factor 1 °F·s/Btu = 0.000277592 °F·h/Btu for manual calculations.
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Combine resistance values with area data for accurate insulation R-value assessments.
Limitations
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Units are specific to the Imperial/British system and require separate conversion when working with SI units.
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Incorrect matching of heat flow units (Btu/s versus Btu/h) can lead to errors in calculations.
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Conversion involves dividing by 3600, so numerical precision is important for transient simulations.
Frequently Asked Questions
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What does degree Fahrenheit second/Btu (IT) measure?
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It measures thermal resistance by expressing temperature difference per heat flow rate of one Btu per second.
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Why convert degree Fahrenheit second/Btu (IT) to degree Fahrenheit hour/Btu (th)?
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Because many HVAC and insulation calculations use heat flow expressed per hour, converting units ensures compatibility.
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Can I convert these units directly to SI units?
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Yes, but additional conversions are needed since the imperial units must be transformed into kelvins and watts.
Key Terminology
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Degree Fahrenheit second/Btu (IT)
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A thermal resistance unit relating temperature difference in °F per Btu/s of heat flow, used in Imperial system thermal calculations.
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Degree Fahrenheit hour/Btu (th)
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A thermal resistance unit expressing temperature difference in °F per Btu/h of heat flow, commonly used in building insulation and HVAC.
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Thermal Resistance
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A measure of a material's or assembly's ability to resist heat flow, quantified as temperature difference per unit heat flow rate.